Expand the following using identities:
(0.1x - 0.9)²
Solve in 9th standard method
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Question :- Expand the following using identities:
(0.1x - 0.9)² ?
Answer :-
→ (0.1x - 0.9)²
using (a - b)² = a² + b² - 2ab , we have,
- a = 0.1x
- b = 0.9
then,
→ (0.1x - 0.9)²
→ (0.1x)² + (0.9)² - 2 * 0.1x * 0.9
→ 0.01x² + 0.81 - 0.18x
→ (0.01x² - 0.18x + 0.81) (Ans.)
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if a^2+ab+b^2=25
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(a+b+c)² - 100 = ...
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